Printing-press cylinder



May 2o, 1930. G. 1 FULK 1,759,192

Patented May 20, 1930 I UNITED STATES GEORGE :rirumav or CLEVELAND, orrro,

TION DELAWARE Application filed June 2, 1927.

This invention relates to printing press cylinders, and more particularly to long plate and tympan cylinders for large presses. In large printing presses having long print- 5 ing cylinders which are supported in pairs at the end thereof, the cylinders have a tendency to sag in the middle and it has always been necessary to compensate for the sagging of the cylinders by wrapping additional layers of paper upon the central'portion of the tympan cylinder in order to maintain the necessary pressure between the cylinders at the center thereof. Further, it has always y been necessary to make the long cylinders of '15 a diameter considerably greater than cylinders of smaller presses in order to obtain the necessary rigidity to prevent excessive sagging between the widely spaced bearings. The increase in the diameter of the cylinders adds to the cost thereof, makes the interchange of Cylinders more difficult, makes it necessary to increase the number of plates on the plate cylinder and increases the labor incident to the changing of the plates in setting up the cylinders for a new job of printing.

The present invention has for its object to kprovide long printing cylinders of relatively small diameter which are so constructed and supported that they do not sag between their bearings, making it unnecessary to provide eXtra windings of paper on the tympan cylinder and makingit unnecessary to provide a greater number of plates on the plate cylinder.

lVith the above and other objects in view, the invention may be said to comprise construction illustrated in the accompanying drawings hereinafter described and particularly set forth in the appended claims, to-

gether with such variations and modifications thereof as will be apparent to one skilled in the art to which the invention appertains.

Reference should be had to the accompanying drawings forming a part of this specification in which:

Fig. 1 is a longitudinal section through the printing cylinder, its supporting shaft and bearings; Y

vPa'rlN'r oFFICE y AssIeNoR, :ev` MnsNn ASSIGNMENTS, 'ro;: BoNNAn-VAWTER rANronM COMPANY, rNo, or oLEvnLAND, oHIo, A co'nroRA.-y

PRINTING-PRESS CYLILDER.V

serial No. 19eme.

Fig. 2 is a sectional perspective view of .a

f plate cylinder; and v Fig. 3 is a transverse sectionthrough-a tympan cylinder.

As shown in the accompanying drawings" thecylinders Vare supported upon a tubular.

shaft 1 which is j ournaled in bearings 2 in the opposite sides of the press frame, a tubular shaft being employed for the reason that thisy lform of shaft has the necessary rigidity and due to its lightness does not sag between bearings. As is well understood in the art, the plate and tympan cylinders of aA printing peripheries in contact and are driven Vin opposite directions'to feed thepaper between them. One of the supporting shafts is provided with a bevel gear 3 by which it may be 'press are mounted side by side with their;

driven, and the shafts are provided with..

gears 4 which intermesh so that one cylinder is driven from the other. l Thegear 4 is mounted upon the inside of the bearing 2 at one side of the pressand has rigidly attached thereto one of the end members 5 of the cylinder, the other end member 6 of the vcylinder fitting upon the shaft 1 immediately to the underside of the bearing2 at the opposite side of the frame. The cylinder proper, indicated by the numerall', is in the form of a casting mounted'betv'veen the end members 5l and 6, the plate and tympan cylinders being identical in construction except thatv the plate cylinder is provided exteriorly with longitudinal grooves 8 in which the plates are fastened,

andthe tympan cylinder is provided with a .ter thereof. :[norderto further stifen th-e cylinder, thecylinder is provided with regul'arly" spaced longitudinally extending'i internal .ribs 13 which extend from the'en'ds' of 'the cylinder to the annular ribs l2 and from one anniilar'rib tojthe other, the ribs 13V being of less height than the ribs Vl2 so that the inner edges thereof are out of Contact with the shaft l.

' By utlizingprinting cylinders. constructed fand supported `as above described, I have been enabled to use 106. inch Cylinders rolfY l0 inch diameter which is the 'standard size for Vshorter cylinders and these long. Cylinders of smallrdiameter have'no perceptible sag and it is unnecessary to provide additional layers of paper upon the center of the tympan'V cylinder. The bearing ribs 12 impose the weight of the eylinder uponthe ftubul'ar shaft atY points between the bearings and the middle y Vport-ion ofthe shaftf'Due to the relatively short span betweenthe ribs l2, the ycylinder y 'does not sag lunder itszown weight. The Vribs 13v being v out of Contact lwith Vthe shaft, the `weight of the eylinderis imposed yon the shaft at Vthe ribs l2 only,l and since these ribs. are relatively Close to the end bearings, the shaft l fis enabled to earry'theload without sagging.

Furthermore, since the shaft is ontov contact withA the eylinderbetween" the ribs 12, it maybend'slightlyindependently of the cylinder.4 WV ,Y

Having thus [described my invention, I claim 1.,:InV a printing press, the eombination with atubular shaft having bearing-supports VVat the opposite ends thereof, of a hollow printing-cylinder mounted on said shaft between the bearing supports, end. inem-bers `for n said' cylinderbearing upon said shaft, said Vcylinder havingan internal diameter greater than'the external diameter of the shaitt, said Ycylinder havingr an internal annular rib kspaced inwardly 'from each end member and Ybearing upon the shaft `between the ven d of `the cylinder and the center thereoffor supporting said cylinder between said'end members. Y '1 Y Y K 2.'In' a printinsor piess,r"the combination witha tubular shaft having bearing supports at the opposite endsV thereof. of a hol low printing cylinder mounted onV said shaft between the lbearing supports, said Cylinder having an .internal diameter greaterthan the externaldiameter of the shatt,said VCylinder 'having end members itting upon the shaft of a hollow elongated printingeylnder on f said shaft between said. bearing supports,

end members for supporting the end por n tions of said cylinder, and an internal'annu- 'zov Y adj aeent thebearingsupports and having an internalannular rib'spaeed inwardly `frein ea'Ch'end memberl and bearing upon thelsha'ft between the end of the lCylinderand theV center thereof, said Cylinder having also. longitudinally 'extending angularly Yspaced' internal -ribs extending vfrom-'the .ends thereof to so saidv annular ribs and n' between said annular ribs, said longitudinal ribsV being` ,of ,less

A height than saidannularribs whereby their 'edges arelspae'ed from theeshaft..

withai'Sh-lfhaving'spaeed bearing'supports,

GEORGE L.. FULK. 'y Y 

